Update README.md

Author: Harikrishna Menon

README.md

@@ -5,6 +5,8 @@ A JSON-LD processor for .NET.
 
 v1.0.5 is available on NuGet.org at https://www.nuget.org/packages/json-ld.net/
 
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
+
 #### Supported frameworks
 
 * NET 4.0